Group message problems

I've been having problems with group messaging for awhile now but I'm deciding to post about it because it's gotten pretty bad.

The most obvious thing is how I have 5 separate groups with the same people, and every time I remove people from it, it always finds a way of popping back up. Is there a way to solve this once and for all? To condense the many groups into just one?

Also, the groups on iMessage on my Mac are separated and when I type a message in one group, it pops up in an entirely separate one when viewed on my phone.

I feel part of the problem could be that not everyone in the group message has iOS 8 but there has to be a work around..

Any help would be great!

 

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